Device for securing an element of an oscillating electric circuit to a support



Feb. 8, 1949. c. PITON 2,461,441

DEVICE FOR SECURING AN ELEMENT OF AN OSCILLATING ELECTRIC CIRCUIT TO A SUPPORT Filed Nov. 19, 1946 Patented Feb. 8, 1949 DEVICE FOR SECURING AN ELEMENT OF AN OSCILLATING ELECTRIC CIRCUIT TO A SUPPORT Charles Piton, Geneva,

Hermann Thorens S.

zerland Switzerland, assignor to a corporation of Swit- Application November 19, 1946, Serial No. 710,786 In Switzerland August 19, 1944 .6 Claims.

The present invention relates to a securing and insulating device, particularly for the purpose of being used in the construction of radio-electric apparatus, induction coils, high frequency transformers and so forth, in all cases Where it is desired to secure an element of an oscillating electrical circuit and to insulate it relatively to the latter, in a desired position on a support.

The majority of the devices of this character which have been constructed hitherto have been provided with members of insulating material assembled by means of securing devices with a screw thread, such as bolts or screws and nuts. The use of members with a screw thread have the disadvantage that the tightening of these members gives rise to forces which cannot be controlled, which may be prejudicial to the insulating material, which is generally fragile, and produce tensions both in the element to be secured to the support, which tensions are liable to cause a subsequent movement between the two parts.

The device forming the subject of the present invention tends to eliminate the disadvantages referred to. It is distinguished in that it has at least two securing members, of insulating material, each sliding in a groove provided in a part of the element of the oscillating circuit, the securing members having at one end thereof a connecting member adapted to be secured to the support, a device being provided for preventing any movement of the securing members perpendicularly to the axis of the groove.

A form of construction of a device, forming thesubject of the invention, is shown by way of example in the accompanying drawing, wherein:

Fig. 1 is a cross-section of the device.

Fig. 2 is a longitudinal section of the device.

Fig. 3 shows a perspective view of the various elements forming the device.

The example shown in the drawing is applied to the construction of a variable condenser formed by a stationary armature and a movable armature, the armatures being provided with electrodes in the form of concentric cylinders, the electrodes of the movable armature projecting between those of the stationary armature.

In a casing H is mounted a spindle i2 supporting the movable armature, not shown. The stationary armature is formed by a circular plate l3 provided with a series of electrodes M in the form of concentric cylinders of revolution. In the thickness of the plate l3 are milled four grooves I5 of dove-tailed cross-section and arranged radially, The stationary armature is secured to the casing l l by means of three insulators iii of triangular cross-section each sliding in one of the grooves i5. A cambered blade spring l7, located in each of the grooves between the bottom of the groove and the insulator, causes the insulator to bear against the lateral faces of the groove and thus prevents any movement thereof perpendicularly to the axis of the groove. Each of the insulators I6 is provided with a connecting member 18 formed by a few turns of a coiled spring so dimensioned as to hold by tightening on a cylindrical part i9 provided at one of the ends of each of the insulators. The casing H is provided with four openings 20 located opposite the grooves I5. In three of the openings are seated ferrules 2| with which the connecting members l8 engage with considerable clearance. Finally the fourth groove l5 serves as a seating for a terminal 22 serving to ensure connection between the circular plate l3 and a point outside the casing.

The placing in position of the device applied to the variable condenser is effected in the following manner: The three insulators l6, fitted with their connecting member l8, are engaged with the grooves I 5 at the same time as the cambered springs 11. The complete stationary armature is then introduced into the casing H and arranged co-axially with the movable armature, not shown. When the centering has been eifected, the three ferrules 2| are secured to the casing by means of a blob of solder at 23 and the stationary armature is secured to the casing by blobs of solder at 24 between the connecting members and the ferrules. By reason of the clearance provided between the latter, the stationary armature may be brought into the desired position relatively to the movable armature before being locked relatively to the casing. It now only remains to insert the terminal 22 into the fourth groove.

The device described has the advantage of not being provided with any element having a screw thread. The insulators are only subjected to forces, determinable with precision, by the springs I! and I8. The element to be secured may be brought into a desired position relatively to its support by reason of the fact that the insulators may slide in their grooves and as considerable clearance is provided between the connecting members and the ferrules. Finally as the securing between the latter is efiected by a blob of solder any danger of tension between the elements to be assembled is eliminated. Two insulators, which are not parallel, suffice to lock an element on its support.

It will be understood that the securing element of insulating material may have'any shape which enables it to slide in a groove and that means other than the c'ambered spring'li may provided for preventing any movement of this securing member perpendicularly to the axis of the groove. Similarly the connecting member may be of any other shape and be secured to the support by means other than a blob of solder.

I claim:

1. In an element of an oscillating electrical circuit, said element having a part provided with at least two elongated grooves of polygonal cross :section and a support for said part, atlea'stftwo securing members of insulating material each mounted with play in a groove for longitudinal sliding movement, a connecting member connect- :ingone end of each securing member to said support, and means for maintaining said sliding 's'ecuringmembers in permanent contact with at least-two of the walls of said grooves in a manner to prevent movement of said members in said {grooves in directions perpendicularly to axis of. sliding.

2. In an element of an oscillating electrical cir- 'cuit, said element having a part provided with least two elongated grooves of dovetail cross section and a support for said part, at least two securing members of insulating material of triangular cross section, each mounted with play in agroove for longitudinal sliding movement, a connecting member connecting one end of each securing member to said support, and means for maintaining said sliding securing members in permanent contact 1,2111 at least two of the walls of 'saidgr-ooves in a manner to prevent movement of said members in said grooves in directions perpendicularly to the axis of sliding.

3. In an element of an oscillating electrical circuit, said element having a part provided with at least two elongated grooves of dovetail cross section and a support for said part, at least two securing members of insulating material of tri angular cross section, each mounted withplay in a groove for longitudinal sliding movement, a connecting member connecting one end of each securing member to said support, and a cambered blade spring located in each groove betweenthe securing members therein and the bottom of the groove between the securing members therein and the bottom of the groove to press the securing member against the lateral faces of the groove in a manner to prevent movement of said members in said grooves in directions perpendicularly to the axis of sliding.

:4. In an element of an oscillating electrical circult, said element having a part provided with'at least two elongated grooves of dovetail cross section and a support for said part, at leasttwo tion and a support for said part,

of said grooves in a manner to prevent movement of said members in said groovesin directions perpendicularly to the axis of sliding, said connesting members being formed of coil springs resiliently gripping a portion of said securing members. V

5. In an element of an oscillating electrical circuit, said element having a part provided with at leasttwo elongated grooves of dovetail cross secat least two securing members of insulating material of triangular cross section, each mounted with play in a groove for longitudinal sliding movement, a com nection member in the form of coil springs resiliently gripping'the'ends of the securing memand solder connecting the coil springs to said support for connecting one, end of each secur i g member to said support, and means for inainning said sliding securing members in permanent contact withat least two of the walls of said grooves a manner to prevent movement of 5.111 an element of ,an oscillating electrical circuit, said element having a part provided with 5 least two elongated grooves of dovetail cross sect'on anda support for said part, at least two securing members of insulating material of .tri-v angular cross section, each .mounted with play in a groove for longitudinal sliding movement, connecting member in the form of coil springs resiliently gripping the ends of the securing members, and solder connectinglthe coil springs to said support for connecting one end of each securin member to said support and a cambered blade ,pring located in each groove between the. securing member therein and the bottom oi groove to press the securing member against thelateral faces of the groove in a manner ,to prevent movement of said members in said grooves in directions perpendicularly to the axis of'sliding.

CHARLES PITON.

sarcasm-ins orrnn The following references are of record in the file of this patent: 

